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Magnetic structure; neutron diffraction; alloys

Magnetic behaviour of di-metal iron phosphide with a small substitution of iron by chromium, (Fe_0.97Cr_0.03)₂P, has been studied using SQUID magnetometry and powder neutron diffraction. It is paramagnetic at temperatures above ∼180 K with persisting short range ferromagnetic (FM) order. At lower temperatures three different regions of magnetic behaviour are identified. FM order evolves in the region 180 K-120 K but much more slowly and with much less magnetic moments than in Fe₂P. In the region 120 K-50 K negative exchange interactions gain some importance leading to a loss of FM order. Below 50 K FM interactions again dominate. Pinning centres influence the behaviour at low temperature up to ∼100 K.

Sudhish Kumar¹ S K Paranjpe^{1 2} Bipin K Srivastava¹ Anjali Krishnamurthy¹ V C Sahni^{1 3}

1. Department of Physics, University of Rajasthan, Jaipur - 302 004, India
2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
3. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India

Published

January 1999

Manuscript received

24 February 1998

Manuscript revised

3 August 1998